Microcontroller Boards

What are they?

Why are they so successful?

The Arduino IDE

Arduino Shields

The family grew very big!

Are there alternatives to Arduinos?

Texas Instrument LaunchPad

The Wiring S Board

Where are we going?

Smaller and cheaper...

DigiStump's DigiSpark

More connected...

Spark's Core and Electron

More wearable...

Arduino Lilypad (Jacek Spiewla’s BeatGlove) and Adafruit Flora

More powerful...

Arduino Yun and Intel Edison

What's next?

Controller examples

Hybrid approach to control physical models

Latest Prototype of the BladeAxe

Haptic feedback

Ed Berdahl's FireFader / Apple's "Taptic" Technology

Embedded Linux Boards

From Gumstix to Raspberry Pi

Raspberry Pi

BeagleBone

UDOO

Pros

• Extremely easy to use
• Runs Linux
• Power of the community
• Price
• Simplicity
• Versatility
• Plurality

Cons

• Plurality
• It is what it is...
• Limited power
• Booting time
• Compatibility with external hardware
• Sometime victim of their own success

Embedded programming environments

• libFaust
• libPD
• CSOUND API
• Tannhäuser -> Heavy

DSP shields and FPGA boards

Audio Codec Shield

FPGA Boards

Gadget Factory's Papilio

DSP shields

Axoloti / Simple DSP / Arduino DSP Shield

Stanford / Texas Instrument DSP Shield

Related Projects

ModDuo / Owl / LeafLabs Maple / StompShield / Open Stomp Coyote

Mobile Platforms

Example: the Moforte Guitar and Geo Shred

The MoForte Guitar

• Full electric guitar + effects (implemented in Faust): 6 strings, general excitations, distortion, compression, phaser, 5 bands parametric equalizer, feedback, wah pedal and autowah, flanger, reverb
• Responds to accelerometers, gyros, touches (pluck), swipes (strumming), etc.
• Historically related to the Stanford Sondius Project, ca. 1995

A Word About Software Licenses

• moForte guitar is a commercial offering using FOSS
• Liberal licensing such as in FAUST makes this possible
• GPL motivates complete rewrites from scratch
• MIT license is one of the best (“just run with it”), as are BSD, STK
• moForte presently consists of two guys (Pat and Nick) plus JOS (consulting), and commercial is their only option right now
• We can contribute freely when we can, but otherwise, commercial products based on FOSS should be ok
• For general purpose tools, consider the MIT license extended to request that bugfixes be submitted upstream
• GPL makes sense for finished apps, but unrestricted libraries ideal
• "Free for free use" + reasonable commercial license fee also works

Supporting and Organizing FOSS Development

• We can create better systems for prioritizing, addressing, and funding FOSS development
• Kickstarter model is good, but need something lighter weight for smaller software components
• Google Summer of Code (SOC) is great, but also large-grained and hard to get into

FOSS Small-Task Example

• Perfect example of a bid/hire item
• Company receives a lower rate if contributing the improvement for all (e.g., 50%)
• Developer sees the same compensation, making it possible to do the work
• A general FOSS fund can support the discounted rate

iOS vs. Android: the sad truth

Measured Latency on Different Mobile Devices at 44.1KHz (Buffer Length 512 samples)

Webaudio

A quick example...

I Dropped my Phone the Screen Cracked

Two more complete example...

WAAX

DAW Plugins for Web Browsers (Aalto University)

What is good? What is working?

• Cross-platform
• Great for collaboration
• Open source in essence
• Wide variety of pre-made objects
• Simple to use
• Precise scheduling

What will be working?

(may be)

• MIDI support
• Audio workers
• Better performances
• More than stereo output
• Compatibility of all the web browsers with Jack?

A more global vision of the use of the webaudio API in the open source world:

The Faust PlayGround

An interesting thing to look at:

Ionic

SonicCanvas: a good example by Trijeet Mukhopadhyay

3D Printing

3D Printing and Open Source Software

• Lots of "Open Source" DIY 3D Printers

VoxVel by John Granzow and Fernando Lopez-Lezcano

3D Printing and Open Source Software

• Lots of "Open Source" DIY 3D Printers
• Huge community of "Makers" across the world
• Open Source CAD softwares are still far away from commercial counterparts
• Good medium for "electronic lutherie" and prototyping: CCRMA Workshop
• Huge potential for research in music and Acoustics

3D Printing of Vocal Tract Models Derived from MRI of Expert Pitch Bends on the Harmonica

Scott Summit's 3D Printed Acoustic Guitar

Faust

Faust Architectures (1)

Faust Architectures (2)

Getting Started with Faust

• Faust Website: http://faust.grame.fr/ (Click on "Online Examples" and type in some Faust code!)
• Faust Intro: https://ccrma.stanford.edu/~jos/aspf/ (Google Search: "Audio Signal Processing in Faust")
• Faust is Free Open Source Software (FOSS) for Mac OS, Linux, Windows, and more...

Research

Nonlinear Wave Digital Filters

Scattering Delay Networks (SDN)

• Wall-to-wall reflections modeled by digital waveguides
• Extra waveguides match direct signal and early reflections